1		2
							1
7	6						4
			3	1
			4	5
8						2	6
5
				7		1

Difficulty: Very easy (0)

		2
	3			2			1
6	2			7
8	1
						5	7
			5			2	4
2			4			6
					3

Difficulty: Easy (0)

	4	1		2		8
	8		1
			6			1
	5			8
				1		7
	2		8		6	5

Difficulty: Very easy (0)

					6	7
1
	5			8
	8			6
			3			8
			5			6
							2
	3	4

Difficulty: Medium (0)